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  4. A double convex lens +5D is made of glass of refractive index 1.5 with both faces of equal radii of curvature . find the value of curvature.

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Q. A double convex lens $+5D$ is made of glass of refractive index $1.5$ with both faces of equal radii of curvature . find the value of curvature.

Solution:

$P=\frac{1}{f}=(\mu-1)\left[\frac{1}{R_{1}}-\frac{1}{R_{2}}\right] ; R_{1}=R_{2}$